Catalyst Design to Direct High-Octane Gasoline Fuel Properties for Improved Engine Efficiency

Connor Nash, Daniel Dupuis, Anurag Kumar, Carrie Farberow, Anh To, Ce Yang, Evan Wegener, Jeffrey Miller, Kinga Unocic, Earl Christensen, Jesse Hensley, Joshua Schaidle, Susan Habas, Daniel Ruddy

Research output: Contribution to journalArticlepeer-review

7 Scopus Citations

Abstract

The paraffin-to-olefin (P/O) ratio in gasoline fuel is a critical metric affecting fuel properties and engine efficiency. In the conversion of dimethyl ether (DME) to high-octane hydrocarbons over BEA zeolite catalysts, the P/O ratio can be controlled through catalyst design. Here, we report bimetallic catalysts that balance the net hydrogenation and dehydrogenation activity during DME homologation. The Cu-Zn/BEA catalyst exhibited greater relative dehydrogenation activity attributed to higher ionic site density, resulting in a lower P/O ratio (6.6) versus the benchmark Cu/BEA (9.4). The Cu-Ni/BEA catalyst exhibited increased hydrogenation due to reduced Ni species, resulting in a higher P/O ratio (19). The product fuel properties were estimated with an efficiency merit function and compared against finished gasolines and a typical alkylate blendstock. Merit values for the hydrocarbon product from all three BEA catalysts exceeded those of the comparison fuels (0–5.3), with the product from Cu-Zn/BEA exhibiting the highest merit value (9.7).

Original languageAmerican English
Article number120801
Number of pages11
JournalApplied Catalysis B: Environmental
Volume301
DOIs
StatePublished - 2022

Bibliographical note

Publisher Copyright:
© 2021 Elsevier B.V.

NREL Publication Number

  • NREL/JA-5100-80304

Keywords

  • Cu/BEA zeolite
  • Dehydrogenation
  • Engine efficiency
  • High octane gasoline
  • Paraffin/olefin ratio

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